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题目(2002陕西省)盛有相等质量稀盐酸的两个烧杯,分别放在天平的两盘上,天平恰好平衡.现分别向左、右两个烧杯中加入等质量的铁粉和铝粉,下列判断中正确的是:
Topics (2002 Shaanxi Province) Two beakers with equal mass of dilute hydrochloric acid were placed on the two plates of the balance, and the balance was exactly balanced. Iron powder and aluminum powder of equal quality were added to the left and right beakers respectively. The correct ones in the following judgments are: